Here’s a quote:

Golden rod is often mistakenly identified as the cause of the horrible hay fever many people suffer from late in the season. But the real culprit is ragweed, whose generic name is Ambrosia. Not because it is the nectar of the gods, but because it was named for the botanist John Ambrose.

http://www.gardenweb.com/cyberplt/plants/asteraceae.html

I’ve been trying to verify this since I read it a few weeks ago, with no luck. I happen to know the author, Barry Glick, and while he might be right, he’s not someone who cares a great deal about these sorts of details.